Early History

Birth of the Klingon Empire

Around the year 900 AD, Qo'noS was ruled by Molor, a tyrannical ruler who was generally unpopular among the people. Kahless the Unforgettable emerged as a champion of the people, and slew Molor in single combat using the first bat'leth, the Sword of Kahless, in the Battle of Qam-Chee. Here, Kahless and the Lady Lukara fought a pitched battle in the city's Great Hall against the soldiers of Molor. While the rest of the city's garrison fled before the 500 soldiers, Kahless and Lukara stood their ground and defeated the forces. Shortly after their victory, the two began what would become known as the greatest romance in Klingon history. (DS9: "Looking for par'Mach in All the Wrong Places") Kahless ruled together with his new wife as Emperor of Qo'noS, building his new empire and also defeating the Fek'Ihri, despite the fact that he was not of noble birth. Kahless proved to be not only a powerful warrior, but a wise and just ruler, establishing a code of honor that was to become the template for Klingon society for centuries to come. Moreover, the defeat of Molor continues to be celebrated in the Empire in the Kot'baval Festival. (TNG: "Firstborn", DS9: "The Sword of Kahless", DS9: "Tacking Into the Wind")

In DS9: "Looking for par'Mach in All the Wrong Places" taking place in 2373, Worf enthusiastically mentions the events in Qam-Chee to have happened "a thousand years ago". In "Rightful Heir" Gowron also states that Kahless has been dead a thousand years. However, that episode also claimed that the monks on Boreth had been awaiting Kahless' return for "15 centuries. (A scene cut also had Data specified his death as 1547 years ago, which would place it in AD 822). However, since 2373 is known to correspond to "the year of Kahless 999", a neat explanation suggests itself in that Worf and Gowron might have been counting in longer Klingon years.

One obvious solution would be that Worf and Gowron were calculating by the Klingon calendar, in which 2373 is known to correspond to "the year of Kahless 999", ("Soldiers of the Empire") and is presumably based on Qo'noS's orbital period.}}

Sometime after Kahless united all Klingons he left. Claiming that he is going to Sto-vo-kor, he pointed to a star and said "Look for me there, on that point of light." The place Kahless pointed out to would later be called Boreth, becoming the most sacred place for Klingons. (TNG: "Rightful Heir")

Whether Kahless words may be interpreted with respect to the space-faring capabilities of Klingons at that time is not known. According to the non-canon Star Trek: Star Charts, the Klingons first achieved warp capability in the Earth year 930 AD, still within the time of Kahless and some six hundred years after the Vulcans. However, according to the manual for Star Trek: Klingon Academy (also non-canon), the Klingons acquired warp drive much later (14th century AD) from the Hur'q during the Hur'q conquest of Qo'noS (see below).

An excerpt of the paq'batlh, a large series of ancient Klingon scrolls and religious texts, that, among other things, passed on the stories of Kahless.

Kahless was not just a warrior, but also a philosopher. During his rule, he established a strict warrior code that was adopted into Klingon culture and tradition. His words are frequently invoked by warriors about to enter battle. Among his sayings are, "A leader is judged not by the length of his reign but by the decisions he makes." (DS9: "Tacking Into the Wind") Kahless' legends were recorded in a series of scrolls called the paq'batlh. (VOY: "Barge of the Dead")

The way to an interstellar empire

Among Kahless' most decisive legacies is not just the creation of the Klingon Empire, but also establishing the position of the Emperor, a title which would last over the following 1,100 years. Noted Emperors include Sompek, who became famous for his conquest of Tong Vey, where ten thousand of his warriors laid siege to the city. When Sompek had taken the city, he ordered the entire population massacred and the city burned to the ground. Emperor Mur'Eq, on the other hand, became known for introducing the use of blunted bat'leths for practice in order to make sure "his warriors kill their enemies and not each other". (TNG: "Rightful Heir"; DS9: "Rules of Engagement", VOY: "Prophecy")

It is probable that the only reason the Hur'q did not completely subjugate Qo'noS is because their attacks took the form of viking-style raids, instead of attempts to take and hold the planet. The non-canon Star Trek: Klingon Academy video game elaborates that when the ancient Klingons drove off the Hur'q raiders, they were able to capture much of their technology, and from this were able to reverse-engineer how to build their own warp-drive equipped spaceships. This is what allowed the relatively non-technology oriented Klingons to make the societal jump to being an interstellar power. It also explains why Klingon warship technology is only roughly on-par with Starfleet technology, despite the fact that they possessed warp drive since 700 years before humans did. Their technology is mostly imitative, based on designed acquired through conquest or reverse-engineered from enemy designs.

Also during the 14th century, some social-religious changes took place within Klingon society, which would later be described as "Klingon warriors, who set out and slew all of their gods, because they were more trouble than they were worth." (DS9: "Homefront")

In the beginning of the 16th century, the Second Dynasty ruled over the Klingon Empire, but was ended with General K'Trelan assassinating Emperor Reclaw then later putting to death all the members of the Imperial Family. During the next ten years, the Empire was ruled by a council elected by the people, which is referred to as "The Dark Time" by Klingon historians. Following this period a new group of Klingons, called the Third Dynasty, were given the titles and names of the original Imperial Family in order to create the illusion of an unbroken line since the true Imperial bloodlines were cut at the end of the Second Dynasty. (DS9: "You Are Cordially Invited")

It is stated in the Star Trek: Star Charts (p. 55) that Klingons had achieved warp capability in the year 930, which is a reference to the Boreth monastery being built shortly after Kahless' death. Quark however specifically stated in "Little Green Men" that the Ferengi would have had warp drive before the Klingons, had he delivered warp technology to Ferenginar in 1947. See Little Green Men - Trivia for more information.

In the late 2140s and early 2150s, the Klingons were engaged in a fierce internal struggle that, while not amounting to actual civil war, threatened to become a more intense conflict. Numerous attacks had taken place throughout the empire that were blamed on various Klingon factions; it was not realized at the time that the attacks had actually been launched by the Suliban Cabal, who were taking orders from a mysterious individual who was an operative in the Temporal Cold War.

Archer, however, did not understand the complexity or importance of Klingon tradition, and did not realize that returning Klaang to Qo'noS was a grave dishonor and insult. However, Klaang carried with him proof that the attacks were in fact launched by the Suliban, which averted a civil war. For this service, Archer and his ship were allowed to leave peacefully. (ENT: "Broken Bow") However, the incident fostered Klingon enmity towards Humans and was widely recognized as setting the stage for decades of future war. (TNG: "First Contact")

By 2153, the Klingon society, including its judicial system, was dominated by the Warrior caste and honor only had a superficial meaning during trials

In early 2153, the Empire again encountered the Enterprise when the Human ship rescued a refugee ship from Raatooras that was attempting to flee Klingon territory. Captain Archer chose to render assistance to the refugees, but failed to realize the ramifications of his actions, particularly the embarrassment he would cause the Klingons. When the Klingons demanded that the refugees be handed over for trial, Archer refused to comply. Captain Duras of the IKS Bortas intercepted the Enterprise and attacked it, unsuccessfully. Archer was later captured and brought to trial on Narendra III, a Klingon colony, for being an "enemy of the state." In an incendiary tribunal, Archer's "interference" with Klingon affairs earned him a life sentence to Rura Penthe. However, Archer managed to quickly escape from the prison, further embarrassing the Klingons. (ENT: "Judgment")

The Klingons launched several further attempts to recapture Archer, including hiring bounty hunters (ENT: "Bounty") and sending Duras himself to track the Enterprise and recapture Archer. However, Duras was unsuccessful in three different attacks against the Enterprise, and he was finally killed when the Enterprise destroyed his ship during the third attack, on the edges of the Delphic Expanse. (ENT: "The Expanse")

Augment Crisis

On its way to apprehend the rogue Human Augments in 2154, Enterprise disables a D5 class battle cruiser

The Klingon Empire nearly went to war with Earth during the Augment Crisis in May 2154, when a group of Humans hijacked a Bird-of-Prey and ejected its crew into space. Planning to devastate humanity, the Augments tried to escalate the incident by annihilating the Klingon Qu'Vat colony with a biogenic weapon. Fortunately, war was averted when Enterprise destroyed the rogue Humans responsible and saved the colony. (ENT: "Borderland", "The Augments")

A short time later, the Klingons found genetic material of the Human Augments within the wreckage of the hijacked Bird-of-Prey. Fearing that Starfleet may be attempting to create genetically-superior Humans to take over the Empire, they tried to adapt this genetic engineering to improve themselves. An unanticipated side effect was that the Augment DNA caused the Klingon cranial ridges to dissolve. The test subjects did gain increased strength and intelligence, but then their neural pathways started to degrade and they died in agony. One of the subjects was suffering from the Levodian flu, which was modified by the Augment genes to become a deadly, airborne plague that spread rampantly within the Empire posing its gravest threat since the Hur'q invasion. In the first stage of this plague, a Klingon's physiology mutated to become more Human, for which the degeneration of the cranial ridges was a symptom.

With the help of a Klingon scientist named Antaak, Dr. Phlox of the Enterprise was able to formulate a cure that halted the genetic effects of the virus in the first stage, retaining the changes in appearance along with some minor neural re-ordering, but with no development of stage two characteristics, such as enhanced strength, speed, or endurance. This left millions of Klingons, mostly in the warrior caste, without their ridges. As these alterations were even passed on to their children, Phlox and Antaak theorized, that surgical cranial reconstruction might become quite popular for Klingons, who want to restore their outer appearance. Nevertheless, this whole incident embarrassed the Klingons even further and the Empire no doubt began to feel much more contempt for Humans, who were responsible for creating the genetic material in the first place. (ENT: "Affliction", "Divergence")

There is no way to tell when a final cure for the Augment virus was found, or if it was found at all. Any Klingon shown originally without cranial ridges in TOS and then with them in subsequent time periods (e.g. Kang, Koloth and Kor), might simply have undergone surgical cranial reconstruction. Other differences in attitude and methodology between the TOS and non-TOS Klingons can perhaps be attributed to the neural re-ordering caused by the virus.

The Federation was quickly expanding, and its territory began to approach that of the Empire. Conflicts over ownership of various star systems arose, e.g. the inconclusive Battle of Donatu V in 2245. Other disputed worlds included Sherman's Planet, the Archanis sector, and Organia, but both sides refrained from committing to open warfare although numerous skirmishes were fought between the Federation Starfleet and Klingon forces during this time.

However, in 2267 negotiations between the two sides broke down, and the Federation officially declared war against the Empire. The Klingons launched an immediate offensive, seizing several planets including the strategically important Organia. Unexpectedly, the Klingon-Federation War was brought to a sudden conclusion just days after it had begun when the Organians, a race of massively powerful noncorporeal beings, intervened and forced both sides to end hostilities. The Treaty of Organia was then imposed, establishing a neutral zone separating the two powers and instituting a procedure, to be overseen by the Organians, through which planets along the border could be claimed and settled by both sides. (TOS: "Errand of Mercy", "The Trouble with Tribbles", DS9: "Apocalypse Rising")

In that same year, a brief but ultimately unsuccessful thawing in relations occurred between the Federation, the Klingon Empire, and the Romulan Empire, with the founding of a jointly-managed colony on Nimbus III. Dubbed the "planet of galactic peace," the colony quickly became an embarrassing failure for all three governments, although regular meetings between representatives did take place at the colony for at least the next twenty years. (Star Trek V: The Final Frontier)

Production sources indicate that the Romulans and Klingons entered in a brief alliance (see Romulan-Klingon Alliance), including a technological exchange, in which the Klingons received cloaking technology in trade for D7-class battle cruisers. Possibly, the Battle of Klach D'Kel Brakt marked the preliminary end of this cooperation.

Tensions between the Klingons and the Federation again came to a head in the 2280s with the revelation of the secret Project Genesis, a scientific program developing an advanced method of quickly terraforming worlds – but a method which also had great potential for causing destruction. The Klingons sent a Bird-of-Prey to covertly obtain the secrets of the Genesis Planet, while at the same time negotiating openly with the Federation. The Klingons planned to accuse the Federation of duplicity in developing Genesis as a weapon of awesome power and using the negotiations as a cover. (Star Trek III: The Search for Spock) However, when the crew of the USS Enterprise, commanded by James T. Kirk, managed to capture the Bird-of-Prey, the Klingon ambassador proclaimed a vendetta against Kirk in 2286, vowing, "there shall be no peace so long as Kirk lives!" (Star Trek IV: The Voyage Home)

Peace with the Federation

Although negotiations had proceeded intermittently since the imposition of the Organian Peace Treaty, no major progress was made in establishing any firm relationship between the two powers. The most notable meeting, however, were a series of negotiations at the Korvat colony in 2289, where Federation mediator Curzon Dax met with Kang. No lasting agreement was reached at this meeting, but Dax did manage to gain grudging respect from the Klingons and establish a lasting rapport. (DS9: "Blood Oath")

The situation abruptly changed with the explosion of the Klingon moon of Praxis in 2293. The disaster caused major problems for the Klingon economy and military, as well as a major ecological crisis on Qo'noS itself. The Chancellor of the Klingon High Council, Gorkon, took the controversial move of proposing a full peace treaty and establishing a process for dismantling the military fortifications and outposts along their mutual border – the military emplacements and warships that the Klingons could no longer afford.

However, peace would not come easily. While en route to a meeting with the Federation president on Earth, Gorkon was assassinated by Starfleet conspirators from the USS Enterprise-A, who were working in cooperation with Klingon counterparts who also opposed any peace treaty between the two enemies. Gorkon's daughter, Azetbur, was appointed as the new chancellor in her father's place, and despite enormous pressure from her advisers to abandon the peace initiative, she chose to press forward and see her father's vision fulfilled. The ensuing Khitomer Conference resulted in the signing of the Khitomer Accords, a treaty which became the foundation for peace between the Federation and the Klingon Empire. (Star Trek VI: The Undiscovered Country)

24th century

Ongoing détente

The sacrifice of the USS Enterprise-C in 2344 proved instrumental in maintaining and expanding the détente between the Klingon Empire and the Federation

The Klingon-Federation relationship, however, remained rocky for the next several decades, although negotiations for a new peace treaty had begun by 2344. That same year, a single courageous act by the crew of a Federation starship would finally change relations for the better, when the USS Enterprise-C responded to a distress signal from the Klingon outpost on Narendra III, which was under attack by the Romulans. Despite overwhelming odds, the Enterprise-C rushed to the rescue and was destroyed. The crew's conspicuous heroism and ultimate sacrifice in attempting to protect potential enemies left a lasting impression on the Klingons paving the way to further rapprochement towards the Federation. (TNG: "Yesterday's Enterprise")

It had not been exactly clarified how tense the relations between the Empire and the Federation really were by 2344. As the temporary removal of the Enterprise-C from the primary timeline resulted in a fierce war between the two powers in an alternate 2366, we might assume that the situation was very volatile, despite the ongoing talks for a new peace treaty. Although never established in canon, this treaty had been theorized to be the later mentioned Treaty of Alliance.

In 2346, two years after its attack on Narendra III, but still at a time when it was supposed to be "an ally" of the Klingons, the Romulan Star Empire attacked the Klingon planet Khitomer and killed almost all of the 4,000 colonists. The raid was made possible by the traitor Ja'rod of the House of Duras, who supplied the Romulans with the codes of the colony's defense shields. With the USS Intrepid it was again a Federation vessel to be the first ship responding to the distress signal. (TNG: "The Neutral Zone", "Sins of the Father")

The remark on a possible Klingon-Romulan Alliance at the time of the Khitomer Massacre is based on the TNG episode "The Neutral Zone", where Worf states: "Romulans killed my parents in an attack on Khitomer at a time when they were supposed to be our allies." As a technological exchange between Romulus and Qo'noS in the 2260s, as well as Romulans being "blood enemies" of the Klingons in 2292 again is evidenced on screen, it is plausible to assume that official Klingon-Romulan relations have been very erratic over the 23rd and 24th centuries.

Civil war

Despite the establishment of a full peace treaty with the Federation, the Empire would not remain at peace for very long. During the reign of K'mpec, the longest-lived chancellor in Klingon history, two rival factions developed in the Klingon High Council. One, led by Duras, who was also secretly allied with Romulan interests who were seeking to split the Federation-Klingon alliance, advocated setting an independent and aggressive policy. In 2366, K'mpec, with the help of Worf, son of Mogh, even had to conceal the treason commited on Khitomer 20 years earlier by Duras' father, Ja'rod - simply to avert civil war. The other faction was led by Gowron and favored continuing the peaceful relationship with the Federation. After K'mpec died of poisoning in 2367, the two factions were on the verge of starting a new civil war. (TNG: "Sins of the Father", "Reunion")

Although Duras was killed by Worf and his relationship with the Romulans exposed, Duras's sisters, Lursa and B'Etor continued the struggle in their brother's place. They presented Toral, the illegitimate son of Duras, to challenge Gowron for leadership of the Council. Because the majority of the Council had been corrupted by the House of Duras, they sided with the Duras sisters and walked out of the Council when Arbiter of SuccessionJean-Luc Picard rejected Toral's claim, making official the division of the Empire. (TNG: "Redemption")

The civil war, when it finally broke out, was as bold and bloody as any other conflict in Klingon history. The warriors of the Empire threw themselves into the fight with typical zeal – for example, Kurn was heard to shout, "Our time for glory is here!" In the first three engagements, the forces allied with the Duras family decisively defeated Gowron's allies. However, it was not generally realized at the time that the Duras forces were secretly receiving material aid from the Romulan Empire. The Romulans hoped that a victorious Duras family would end the Federation-Klingon alliance and create a new Romulan-Klingon alliance to shift the balance of power in the quadrant.

However, interests in Starfleet recognized the probability that the Romulans were interfering in the conflict. Jean-Luc Picard and the USS Enterprise-D led a fleet of starships to the Romulan-Klingon border, establishing a blockade and preventing the Romulans from sending the Duras forces further assistance. When the Romulan connection was finally revealed, support quickly fell away from the Duras family, and Gowron successfully reunited the Empire under his leadership. (TNG: "Redemption II")

The "Return" of the Emperor

By 2369, the clerics of Boreth acquired the necessary technology to "recreate" a clone of Kahless the Unforgettable using DNA from the Knife of Kirom and imprinting Kahless' memories, as written down in the sacred texts (most likely the paq'batlh), in the clone's synaptic pathways. The cleric's plan was to counter the corruption and dishonor in the Empire by restoring a strong leadership and re-instating the position of Emperor of the Klingon Empire. "Kahless'" ascension to this post should follow his faked return from Sto-vo-kor, however, worrying about his chancellorship, Gowron was able to expose the plan of the clerics. LieutenantWorf thereby suggested that the clone of Kahless be made Emperor, but only in the sense of a moral leader for the Klingon people, and Gowron remaining chancellor of the Klingon High Council. (TNG: "Rightful Heir")

The Changeling posing as Martok convinced Gowron that the recent civilian uprising in the Cardassian Union had been engineered and supported by the Dominion, and that the uprising heralded an imminent invasion by the Dominion into the Alpha Quadrant. To prevent this invasion from occurring, Gowron launched a massive assault against the Cardassian Empire in early 2372. Emperor Kahless condemned the invasion but was eventually overruled by Gowron, whose goal was to conquer all Cardassian territory to ensure that it could not be taken by the Dominion.

When the Federation Council protested Gowron's actions, Gowron took it as a betrayal of the alliance and withdrew from the Khitomer Accords, ending the Federation-Klingon alliance. Although no declaration of official hostilities was made, a state of near-war developed between the two powers; the Klingons even launched a preemptive attack against the Federation outpost Deep Space 9 in order to capture the remaining free members of the CardassianDetapa Council. However, Deep Space 9 captain Benjamin Sisko pointed out to Gowron that a war between the Federation, the Klingons, and the Cardassians was exactly what the Dominion wanted – a divided Alpha Quadrant that would be ripe for conquest in the future. Faced with this reasoning, Gowron called an end to the invasion and halted the attack against DS9. (DS9: "The Way of the Warrior")

However, peace would not return. The Federation had refused to fight alongside their allies and had actually sided against them in battle, and the Klingons could not forgive or forget this transgression easily. A tense stand-off developed over the next year, with the Klingons attempting to make political inroads against both the Cardassians and the Federation to justify their offensives. (DS9: "Sons of Mogh", "Rules of Engagement")

Finally, in late 2372 and at the Martok Changeling's suggestion, Gowron demanded that the Federation relinquish claims to a number of territories along their mutual border, namely the Archanis sector, or face war. When the Federation Council refused the demands, the Empire launched an invasion with battles fought for Archanis IV, Ajilon Prime and Ganalda IV. The Federation-Klingon War was brutal, but short – only a few weeks after it began, Gowron called an end to the conflict after a Starfleet covert ops team revealed that Martok was actually a shapeshifter, and the entire war had been engineered to divide the two former allies. However, some hostilities continued after Gowron's ceasefire and were only ended when the Dominion began its invasion of the Alpha Quadrant. (DS9: "Broken Link", "Apocalypse Rising", "Nor the Battle to the Strong", "By Inferno's Light")

The Dominion War

When the Dominion annexed the Cardassian Union in mid-2373, the Klingons were quickly defeated by the Jem'Hadar and driven from all of their Cardassian conquests. Faced with the prospect of a larger war against a much more powerful enemy, Gowron agreed to re-sign the Khitomer Accords and renew the alliance with the Federation. In addition, a detachment of Klingon soldiers was assigned to Deep Space 9, commanded by the real Martok, who had been rescued from a Dominion internment camp. (DS9: "By Inferno's Light")

The anti-Dominion alliance gained new, unlikely allies in mid-2374 when the Romulan Empire declared war against the Dominion. Although the Romulans and the Klingons both harbored deep hatred for the other, the two former enemies managed to put aside their differences in order to successfully fight the Dominion. (DS9: "Tears of the Prophets")

However, ultimate victory would eventually come at a very high price. When the Breen Confederacy entered the war in late 2375, the use of the previously-unknown energy dampening weapon effectively nullified the power of Starfleet and the Romulan forces, leaving the Klingons to fight on their own, outnumbered twenty to one. Rather than fight a holding action, however, Gowron ordered that Martok launch a full-scale offensive against the enemy, claiming that they had the advantage of surprise. (DS9: "When It Rains...")

Ostensibly, Gowron hoped to achieve quick victory against the Dominion and claim all of the glory for the Empire in winning the war without the assistance of the Federation or the Romulans. But Gowron's real plan was much more subversive and political. Gowron feared the growing popularity of Martok, who had commanded the Klingon forces on the front lines and was rapidly gaining heroic status among the soldiers of the Empire. Gowron hoped to reclaim some of that popularity for himself by personally commanding the Klingon war effort from Deep Space 9, and by discrediting Martok in sending him on numerous hopeless missions.

When no other Klingons would protest, Worf challenged Gowron to single combat, claiming that Gowron was a coward for jeopardizing the very existence of the Empire (and indeed the safety of the entire Alpha Quadrant) in order to satisfy his need for political security. Worf killed Gowron in the fight, thus claiming the right to rule the Empire himself. However, Worf declined the position and nominated Martok instead. (DS9: "Tacking Into the Wind")

Summary of key dates

14th century: A race from the Gamma Quadrant, which the Klingons call Hur'q, invade Qo'noS. When they leave, they steal valuable artifacts, including the Sword of Kahless. Also during that century "Klingon warriors, set out and slew all of their gods, because they were more trouble than they were worth".

2153: Jonathan Archer of the Enterprise evades Klingon authorities three times after repeatedly "interfering" with the Empire's politics.

2154: Augment Crisis: Enhanced Humans try to annihilate Qu'Vat colony, but ultimately fail in their attempt to ignite a war between the Empire and United Earth. Some months later the Empire uses residue of the Human DNA to breed augmented warriors of its own, but inadvertently creates a virus threatening its very existence. The situation is quickly stabilized, but the virus causes generations of Klingons to loose their cranial ridges amongst others.

2344: Despite ongoing negotiations for a new peace treaty, the Klingon-Federation relations are again tense by this year. The Empire's alliance with the Federation would eventually be cemented by the honorable act of the Federation vessel USS Enterprise-C, which responds to a Klingon distress signal from Narendra III and is destroyed while trying to protect the outpost from a Romulan attack.

2367: After K'mpec dies of poisoning, Gowron, who is opposing the House of Duras, becomes new Chancellor. His position is quickly challenged but eventually affirmed in the brief Klingon Civil War against the Romulan-influenced, but ultimately inferior, House of Duras.

2372: Led by the Martok-Changeling, the Klingon Empire starts an invasion of the Cardassian Union, which is subsequently condemned by the Federation. Later that year, the Federation's and Klingon's old dispute over the Archanis sectorescalates, leading to the Klingon's withdrawal from the Khitomer Accords.

2373: The real Martok is freed after the Changeling impersonating him is revealed earlier this year. The Cardassian Union joins the Dominion, swiftly resolving the Klingon's conflict with the Federation and reinstating the Khitomer Accords. Later that year, the Dominion attacks and captures the Federation station Deep Space 9, beginning the Dominion War against the Empire and the Federation.

2374: With the aid of Klingon ships sent at the last moment by Gowron, the Federation recaptures Deep Space 9. Later that year, the Romulan Star Empire turns the tide of the war as it joins the Empire and the Federation against the Dominion.

2375: The Dominion gains the upper hand in the war again with its alliance with the Breen Confederacy which uses energy dampening weapons. Due to a technical uniqueness of Klingon vessels, the Empire holds the front on its own for some weeks being outnumbered 20:1. Fearing the growing popularity of the successful General Martok, Gowron tries to discredit him by ordering suicidal missions, but is subsequently killed by Worf. Martok becomes the new Klingon Chancellor and, with the help of the Cardassian Rebellion, the Federation Alliance manages to repel the Dominion forces, finally capturing Cardassia Prime later that year and ending the Dominion war with the Treaty of Bajor.

2385: The Klingon Empire fully recovers from its losses during the Dominion War according to an estimate by Section 31.

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